Which of the Following Better Explains 'Buying Process

Which of the following better explains 'Buying Process'? 

A)  Includes determining the purchasing needs, selecting the supplier, arriving at a proper price, specifying terms and conditions, issuing the contract or order, and following up to ensure proper delivery and payment. 
B)  Includes selecting the supplier, specifying terms and conditions, issuing the contract or order, and following up to ensure proper delivery and payment. 
C)  Includes determining the purchasing needs, selecting the supplier, issuing the contract or order, and following up to ensure proper delivery and payment. 
D)  Includes determining the purchasing needs, selecting the supplier, arriving at a proper price, specifying terms and conditions and issuing the contract or order.